An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.
Part of the Andes mountain range, Aconcagua is the second highest of the Seven Summits, behind only Mount Everest in Asia. At 22,837 feet (6,961 meters), not only is it the highest mountain in South America, it is the tallest peak in all of the Americas as well as the Southern and Western Hemispheres.
Denali (/ d Éª Ë n ÉË l i /) (also known as Mount McKinley, its former official name) is the tallest land-based mountain on Earthâwith a vertical rise of about 18,000 feet (5,500 m), as well as the highest mountain peak in North Americaâwith a summit elevation of 20,310 feet (6,190 m) above sea level.